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Flashcards in Cerebellum Deck (72)
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31

_____ from granule cells converge on Purkinje cells.

Parallel fibers

32

Midline cerebellar lesions impair _____.

coordination of stance, gait, posture, and equilibrium

33

Climbing fibers ascending in the _______.

inferior cerebellar peduncle

34

What are the 3 phylogenetic divisions of the cerebellum?

  1. the archicerebellum
  2. the paleocerebellum
  3. the neocerebellum

35

Where do parallel fibers come from?

internal granular cells

36

_____ cerebellar lesions impair coordination of stance, gait, posture, and equilibrium.

Midline (vermis)

37

What is the output of the spinocerebellum paravermis pathway?

the lateral decending tracts and RED NUCLEUS

38

In all zones, the climbing fiber input comes from the ____.

contralateral inferior olivary nucleus (ION)

39

Mossy fibers from varying sources excite _____.

granular cells

40

What happens when a simple spike and a complex spike occur in the same location?

an excitation occurring in an already depolarized cell --> fire together = wire together --> long term depression --> reduce the efficiency of this synapse bc this is INHIBITORY

41

The lateral pathways control _____ while the medial pathways are for ____.

lateral = extremities; medial = postural and balance control

42

What is the function of the vermal region?

  • axial control
  • posture
  • locomotion
  • gaze reflexes

43

What does the cerebrocerebellum pathway project to?

the VL (ventrolateral) nucleus of the thalamus

44

What is the output of the vestibulocerebellum pathway?

vestibular nuclei

45

This zone of the cerebellum has control of modulation of stretch and withdrawl reflexes.

the paravermis

46

The mossy fibers come into the cerebellum and innervate the ____.

granule cells

47

What cells in the cerebellar cortex are inhibitory?

  • the Purkinje cells
  • the inhibitory interneurons

48

What are the 3 problems with synergy?

3 Ds (ataxia):

  1. dysmetria
  2. decomposition of movement
  3. dysdiadochokinesia

49

Parallel fibers from ______ converge on Purkinje cells.

granule cells

50

This zone of the cerebellum has control of the axial skeleton, posture, locomotion, and gaze reflexes.

the vermis

51

Climbing fibers come from the _____.

contralateral inferior olivary nucleus (ION)

52

Name the cerebellar functional zone: the contralateral VA/VL thalamus (and red nucleus)

cerebrocerebellum pathway

53

Cerebellar lesions DO NOT produce _____ or _____ loss.

weakness or sensory loss

54

What is the function of the vermis?

  • axial control
  • posture
  • locomotion
  • gaze reflexes

55

Climbing fibers from the ION converge on the ____ cells.

Purkinje

56

What is the function of the vestibulocerebellum?

  • axial control
  • vestibular control (balance, eye movements)

57

____ from varying sources excite granular cells.

Mossy fibers

58

Climbing fibers are oriented _____ to the plane of the dendritic arbor.

perpendicular

59

What is the HANDS tremor?

Hypotonia

Ataxia (3 Ds)

Nystagmus

Dysarthria

Stance and Gait

(Intention) tremor

60

What directly innervates the Purkinje cells?

the climbing fibers